1 Mesa 6.5 DOS/DJGPP Port v1.8 2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3 4 5 6 Description: 7 ~~~~~~~~~~~~ 8 9 Well, guess what... this is the DOS port of Mesa 6.5, for DJGPP fans... Whoa! 10 The driver uses OSMesa to draw off screen, and then blits the buffer. This is 11 not terribly efficient, and has some drawbacks, but saves maintenance costs. 12 13 14 15 Legal: 16 ~~~~~~ 17 18 Mesa copyright applies. 19 20 21 22 Installation: 23 ~~~~~~~~~~~~~ 24 25 Unzip and type: 26 27 make -f Makefile.DJ [OPTIONS...] 28 29 Available options: 30 31 Environment variables: 32 CPU optimize for the given processor. 33 default = pentium 34 GLIDE path to Glide3 SDK; used with FX. 35 default = $(TOP)/glide3 36 FX=1 build for 3dfx Glide3. Note that this disables 37 compilation of most DMesa code and requires fxMesa. 38 As a consequence, you'll need the DJGPP Glide3 39 library to build any application. 40 default = no 41 X86=1 optimize for x86 (if possible, use MMX, SSE, 3DNow). 42 default = no 43 44 Targets: 45 all: build everything 46 libgl: build GL 47 libglu: build GLU 48 libglut: build GLUT 49 clean: remove object files 50 realclean: remove all generated files 51 52 53 54 Tested on: 55 Video card: Radeon 9500 56 DJGPP: djdev 2.04 + gcc v4.1.0 + make v3.80 57 OS: DOS, Win98SE, WinXP (using Videoport driver) 58 59 60 61 FAQ: 62 ~~~~ 63 64 1. Compilation 65 66 Q) `make' barfs and exits because it cannot find some stupid file. 67 A) You need LFN support. 68 A) When compiling for Glide (FX=1), pay attention to Glide path. 69 70 Q) Libraries built OK, but linker complains about `vsnprintf' every time I 71 compile some demo. 72 A) Upgrade to DJGPP 2.04. 73 A) Add `vsnprintf.c' to the CORE_SOURCES in `src/Makefile.DJ' (untested!). 74 A) Patch `src/mesa/main/imports.c' with the following line: 75 #define vsnprintf(buf, max, fmt, arg) vsprintf(buf, fmt, arg) 76 This hack should be safe in 90% of the cases, but if anything goes wrong, 77 don't come back to me crying. 78 79 Q) `make' complains about DXE3 or something, yet it builds the libraries. 80 A) DXE3 refers to the DJGPP dynamic modules. You'll need either the latest 81 DJGPP distro, or download the separate package from my web page. Read the 82 DXE3 documentation on how to use them. 83 A) When compiling for Glide (FX=1), make sure `glide3x.dxe' can be found in 84 LD_LIBRARY_PATH (or top `lib' directory). 85 86 2. Using Mesa for DJGPP 87 88 Q) Every test I tried crashes badly. 89 A) If you have compiled with SSE and you're running under plain DOS, you 90 have to disable SSE at run-time. See environment variables below. 91 92 Q) DMesa is so SLOOOW! The Win32 OpenGL performs so much better... 93 A) Is that a question? If you have a 3dfx Voodoo (any model), you're 94 lucky (check http://sourceforge.net/projects/glide for the DJGPP port). 95 If you haven't, sorry; everything is done in software. 96 97 Q) I tried to set refresh rate w/ DMesa, but without success. 98 A) Refresh rate control works only for VESA 3.0 and the 3dfx driver (in 99 which case FX_GLIDE_REFRESH will be overwritten if it is defined and 100 is not 0). 101 102 Q) I made a simple application and it does nothing. It exits right away. Not 103 even a blank screen. 104 A) Software drivers (VESA/VGA/NUL) must to be constructed as single-buffered 105 visuals. However, DMesaSwapBuffers must be called to get any output. 106 A) Another weird "feature" is that buffer width must be multiple of 8 (I'm a 107 lazy programmer and I found that the easiest way to keep buffer handling 108 at peak performance ;-). 109 110 Q) I'm getting a "bad font!" fatal error. 111 A) Always use GLUT_STROKE_* and GLUT_BITMAP_* constants when dealing with 112 GLUT fonts. If you're using `glut.dxe', then make sure GLUT_STROKE_* and 113 GLUT_BITMAP_* are mapped to integer constants, not to the actual font 114 address (same mechanism used for Win32 _DLL). 115 116 Q) What is NUL driver good for, if I don't get any output at all? 117 A) For debugging. The NUL driver is very much like OSMesa. Everything is 118 done just the same as VESA/VGA drivers, only it doesn't touch your video 119 hardware. You can query the actual buffer by issuing: 120 DMesaGetIntegerv(DMESA_GET_BUFFER_ADDR, &buffer); 121 and dump it to a file. 122 123 Q) How do I query for a list of available video modes to choose as a visual? 124 A) This is an ugly hack, for which I'm sure I'll burn in hell. 125 First, query for a list of modes: 126 n = DMesaGetIntegerv(DMESA_GET_VIDEO_MODES, NULL); 127 If `n' is strictly positive, you allocate an array of pointers to a given 128 struct (which is guaranteed to be extended only - not changed in future): 129 struct { 130 int xres, yres; 131 int bpp; 132 } **l = malloc(n * sizeof(void *)); 133 Now pass the newly allocated buffer to fill in: 134 DMesaGetIntegerv(DMESA_GET_VIDEO_MODES, (GLint *)l); 135 And collect the info: 136 for (i = 0; i < n; i++) { 137 printf("%dx%d:%d\n", l[i]->xres, l[i]->yres, l[i]->bpp); 138 } 139 140 Q) The GLUT is incomplete. 141 A) See below. 142 143 144 145 libGLUT (the toolkit): 146 ~~~~~~~~~~~~~~~~~~~~~~ 147 148 Well, this "skeletal" GLUT implementation was taken from AllegGL project and 149 heavily changed. Thanks should go to Bernhard Tschirren, Mark Kilgard, Brian 150 Paul and probably others (or probably not ;-). GLUT functionality will be 151 extended only on an "as needed" basis. 152 153 GLUT talks to hardware via PC_HW package which was put together from various 154 pieces I wrote long time ago. It consists from the keyboard, mouse and timer 155 drivers. 156 157 My keyboard driver used only scancodes; as GLUT requires ASCII values for keys, 158 I borrowed the translation tables (and maybe more) from Allegro -- many thanks 159 to Shawn Hargreaves et co. Ctrl-Alt-Del (plus Ctrl-Alt-End, for Windows users) 160 will shut down the GLUT engine unconditionally: it will raise SIGINT, which in 161 turn will (hopefully) call the destructors, thus cleaning up your/my mess ;-) 162 NB: since the DJGPP guys ensured signal handlers won't go beyond program's 163 space (and since dynamic modules shall) the SIGINT can't be hooked (well, it 164 can, but it is useless), therefore you must live with the 'Exiting due to 165 signal SIGINT' message... 166 167 The mouse driver is far from complete (lack of drawing, etc), but is enough to 168 make almost all the demos work. Supports the CuteMouse WheelAPI. 169 170 The timer is pretty versatile for it supports multiple timers with different 171 frequencies. While not being the most accurate timer in the known universe, I 172 think it's OK. Take this example: you have timer A with a very high rate, and 173 then you have timer B with very low rate compared to A; now, A ticks OK, but 174 timer B will probably loose precision! 175 176 As an addition, stdout and stderr are redirected and dumped upon exit. This 177 means that `printf' can be safely called during graphics. A bit of a hack, I 178 know, because all messages come in bulk, but I think it's better than nothing. 179 "Borrowed" from LIBRHUTI (Robert Hoehne). 180 181 Window creating defaults: (0, 0, 300, 300), 16bpp. However, the video mode is 182 chosen in such a way that first window will fit. If you need high resolution 183 with small windows, set initial position far to the right (or way down); then 184 you can move them back to any position right before the main loop. 185 186 187 188 Environment variables: 189 ~~~~~~~~~~~~~~~~~~~~~~ 190 DMESA_NULDRV - (any value) force NUL driver 191 GLUT_FPS - print frames/second statistics to stderr 192 MESA_NO_SSE - (any value) safe option under pure DOS 193 DMESA_GLUT_REFRESH - set vertical screen refresh rate (VESA3) 194 DMESA_GLUT_BPP - set default bits per pixel (VGA needs 8) 195 DMESA_GLUT_ALPHA - set default alpha bits (8) 196 DMESA_GLUT_DEPTH - set default depth bits (16) 197 DMESA_GLUT_STENCIL - set default stencil bits (8) 198 DMESA_GLUT_ACCUM - set default accum bits (16) 199 200 201 202 History: 203 ~~~~~~~~ 204 205 v1.0 (mar-2002) 206 initial release 207 208 v1.1 (sep-2002) 209 + added 3dfx Glide3 support 210 + added refresh rate control 211 + added fonts in GLUT 212 * lots of minor changes 213 214 v1.2 (nov-2002) 215 * synced w/ Mesa-4.1 216 - removed dmesadxe.h 217 218 v1.3 (mar-2003) 219 + enabled OpenGL 1.4 support 220 + added MMX clear/blit routines 221 + enabled SGI's GLU compilation 222 + added samples makefile 223 + added new GLUT functions 224 + added color-index modes 225 + added Matrox Millennium MGA2064W driver 226 + added 8bit FakeColor (thanks to Neil Funk) 227 + added VGA support (to keep Ben Decker happy) 228 ! fixed some compilation errors (reported by Chan Kar Heng) 229 * optimized driver for faster callback access... yeah, right :) 230 * overhauled virtual buffer and internal video drivers 231 * better fxMesa integration 232 * revamped GLUT 233 * switched to DXE3 234 235 v1.4 (dec-2003) 236 + enabled GLUT fonts with DXE 237 + truly added multi-window support in GLUT (for Adrian Woodward) 238 * accomodated makefiles with the new sourcetree 239 * fixed some ALPHA issues 240 * minor changes to PC_HW/timer interface 241 x hacked and slashed the 3dfx driver (w/ help from Hiroshi Morii) 242 243 v1.5 (jan-2004) 244 + added interface to query available "visuals" (GLFW - Marcus Geelnard) 245 + added GLUT timer callback 246 - removed Matrox Millennium MGA2064W driver 247 x more changes to the 3dfx driver 248 249 v1.6 (aug-2004) 250 + implemented NUL driver 251 + added DMesaGetProcAddress and glutGetProcAddress 252 * reorganized fxMesa wrapper to handle multiple contexts 253 ! fixed a horrible bug in VGA initialization routine 254 ! fixed partial clears 255 256 v1.7 (???-2005) 257 + enabled OpenGL 2.0 support 258 + added support for sw texture compression 259 + added FreeGLUT specific functions 260 * no more GLX sources in DOS GLUT 261 * made GLUT timer callbacks less accurate but safer 262 263 v1.8 (apr-2006) 264 * killed lots of code, the driver is now a front-end to OSMesa 265 * fixed problem with WinNT (http://www.volny.cz/martin.sulak/) 266 - removed 3dfx Glide3 support (temporarily?) 267 268 269 270 Contact: 271 ~~~~~~~~ 272 273 Name: Daniel Borca 274 E-mail: dborca (a] users.sourceforge.net 275 WWW: http://www.geocities.com/dborca/ 276
